engine and drivetrain Pigeons under my hood?

[kremington]

Not really, but there's this mysterious noise that my 74 tii makes when the engine is cold - oddly enough a bit like a pigeon that's being squeezed... silly I know, but I can't think of a better description. The noise only occurs when the car is accelerating/decelerating btwn ~2K-3K RPM and it's pretty loud. The noise cannot be reproduced at a stand still revving the engine - which makes it really hard for me to diagnose. The noise subsides when the engine is hot. I'm thinking a vacuum issue or a possibly a valve. Any ideas or guesses? Thanx!

Keith

[ifayeoh]

Perhaps your alternator is too loose? or alternator bearing going bad

[kremington]

Perhaps your alternator is too loose? or alternator bearing going bad

Hmmm.. didn't think of that...I'll check the belt tension. If that were the case, could it only occur while driving? The darnedest thing is that this noise doesn't occur when the car is parked and engine revving... Much appreciated. Thanx

[KFunk]

Perhaps your alternator is too loose? or alternator bearing going bad

Hmmm.. didn't think of that...I'll check the belt tension. If that were the case, could it only occur while driving? The darnedest thing is that this noise doesn't occur when the car is parked and engine revving... Much appreciated. Thanx

that means it depends on the load put on the engine (not the RPM), which often means it has something to do with the fuel supply, or perhaps the air needed. It might also indicate it has something to do with the drivetrain thats not engaged while in neutral...

[JerryC]

Front crossmember going near left side engine mount?

Sway bar rubbing on something?

Torn intake boot?

[snowflake]

Engine load and temperature(expansion)

It goes away once warm.

[snowflake]

Is it possible it's doing this sound only it's less audible throughout the rest of rpm band?

Does it affect engine performance at all?

[madpaddler]

I had the same noise and it turned out it was my grill vibrating at certain rpm's and it sounded like a morning dove taking off.

[dandnpv]

did you check the fan belt. the fan belt is loose on my tii and it makes that kind of a noise. hope this info helps.

dan.

[TobyB]

If your throttle pivot shaft isn't lubed where it hits the firewall,

it can squeak when the motor's not running smoothly.

If your choke's a bit rich, it'll roughen things up, and the vibration

will cause the pivot to make noise.

Do I get the 'long shot' award or what???

t

[ray_]

You do.

Because tii's don't have chokes.

;-)

Cheers,

Ray

If your throttle pivot shaft isn't lubed where it hits the firewall,

it can squeak when the motor's not running smoothly.

If your choke's a bit rich, it'll roughen things up, and the vibration

will cause the pivot to make noise.

Do I get the 'long shot' award or what???

t

[TobyB]

Oh, ok, fine, 'warm- up enrichment regulator' then!

;p

t

[BLUNT]

i had a bad pilot bearing act like that once

[kremington]

Wow, more than a year has gone by since I first posted up this question... Thanks to all for creatively coming up w/ some likely causes. I've had the car up at Casey Motorsports for the past 6 months or so getting some professional treatment. When I get the car back around the end of summer I'll check out your suggestions and leave feedback. Thanx again!